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June 15th, 2026 :: 8:31 am CDT   

Local Weather Report for
Decatur
Illinois, United States

 Current Decatur Weather Conditions Updated June 15th at 6:54 am 
Temperature:61°F Dew Point:54°F
Barometer:30.04 inHg Wind:calm
Humidity:77.1% Visibility:0M
 
 Decatur Weather Forecast Summary  
 
Today
Jun 15th
Tuesday
Jun 16th
Wednesday
Jun 17th
Thursday
Jun 18th
Friday
Jun 19th
Mostly Sunny Mix of Sun and Cloud Thundershowers Mostly Cloudy with Showers Sunny
73°F
70°F
57°F
81°F
56°F
72°F
59°F
69°F
55°F
 
 Decatur Detailed Weather Forecast  
 
Monday, June 15th, 2026
Morning Temperature: 63°F
Sunny.
Afternoon Temperature: 72°F
Sunny.
Evening Temperature: 64°F
Clear. Slight chance of a thunderstorm.
Tuesday, June 16th, 2026
Overnight Temperature: 60°F
Mostly clear.
Morning Temperature: 65°F
Mostly cloudy. Slight chance of a thunderstorm. Windy.
Afternoon Temperature: 65°F
A mix of cloud and sun with a chance of showers. Slight chance of a thunderstorm. Windy.
Evening Temperature: 64°F
Mostly clear with a chance of showers. Slight chance of a thunderstorm. Windy at times.
Wednesday, June 17th, 2026
Overnight Temperature: 57°F
Mostly clear.
Morning Temperature: 64°F
A mix of sun and cloud with a chance of showers. Windy at times.
Afternoon Temperature: 79°F
Mostly sunny with a chance of showers or thundershowers. Wind 20 to 30 mph.
Evening Temperature: 78°F
A mix of clear and cloudy skies with a few showers. Chance of a thunderstorm. Wind 20 to 30 mph.
Thursday, June 18th, 2026
Overnight Temperature: 68°F
Mostly clear with showers likely. Windy.
Morning Temperature: 61°F
Sunny. Windy at times.
Afternoon Temperature: 65°F
Mostly cloudy. Windy at times.
Evening Temperature: 63°F
A mix of cloudy and clear skies.
Friday, June 19th, 2026
Overnight Temperature: 56°F
Clear.
Morning Temperature: 60°F
Sunny. Windy at times.
Afternoon Temperature: 68°F
Sunny. Windy.
Evening Temperature: 62°F
Clear.
Saturday, June 20th, 2026
Overnight Temperature: 56°F
Clear with cloudy periods.
Morning Temperature: 64°F
Mostly cloudy. Windy at times.
Afternoon Temperature: 73°F
A mix of sun and cloud. Windy at times.
Evening Temperature: 68°F
A mix of cloudy and clear skies.
Sunday, June 21st, 2026
Overnight Temperature: 64°F
Mostly cloudy with a chance of showers.
Morning Temperature: 63°F
Cloudy with periods of rain. Windy at times.
Afternoon Temperature: 63°F
Cloudy with sunny periods with periods of rain. Windy at times.
Evening Temperature: 64°F
A mix of clear and cloudy skies with a chance of showers. Windy at times.
Monday, June 22nd, 2026
Overnight Temperature: 55°F
Mostly clear.
Morning Temperature: 62°F
Mostly sunny. Windy at times.
Afternoon Temperature: 72°F
Mostly sunny. Windy at times.
Evening Temperature: 64°F
Mostly clear. Windy at times.
Tuesday, June 23rd, 2026
Overnight Temperature: 57°F
Mostly clear.
Morning Temperature: 61°F
A mix of cloud and sun.
Afternoon Temperature: 71°F
Sunny with cloudy periods.
Evening Temperature: 66°F
Clear.





 

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This WeatherCity Weather Forecast for Decatur, Illinois, United States is computed using a computer-generated forecast model and should be considered experimental. Please confirm this weather information with your official weather information office

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